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This week, 12 stocks get F’s (“strong strong”) in Portfolio Grader‘s three main grading categories, Total Grade, Overall Fundamental Grade, and Quantitative Grade.

These are the worst of the worst in the entire Portfolio Grader database. This week, there are 4,200 stocks and only these 12 get failing marks in all categories to make the dreaded “Triple F” stocks list. Here they are:

Aluminum Corp. of China (NYSE:ACH) is a producer of aluminium, with operations in bauxite mining, alumina refining, primary aluminium smelting, and aluminium fabrication. It also provides ancillary products and services. Shares of the stock have fallen 9.6% since January 1. This is worse than the S&P 500, which has seen a 5.6% increase over the same period. For more information, get Portfolio Grader’s complete analysis of ACH stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.